Before you use the calculator tool:
- Have a recent water and sewer bill nearby to reference while using the calculator
- Look up your property’s measured permeable and impermeable areas on the Stormwater Charge Lookup website.*
*In San Francisco, the typical non-residential property is 95% impermeable. If you are a residential customer, please note that most residential properties fall within the 1,701 - 3,300 square feet range and will not need to provide impermeable and permeable areas.